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PLT04 Design Considerations for Table-Top FELs electron, undulator, acceleration, emittance 10
 
  • F. J. Gruener, S. Becker, T. Eichner, D. Habs, U. Schramm, R. Sousa
    LMU, München
  • M. Geissler, J. Meyer-ter-Vehn
    MPQ, Garching, Munich
  • S. Reiche
    UCLA, Los Angeles, California
  Refinements in laser technology (few-cycle pulse generation, chirped pulse amplification) combined with super-computer-based plasma simulations have brought the discipline of relativistic laser-matter interaction to a new level of predictability. This was recently demonstrated by the generation of brilliant electron bunches with energies on the 100-MeV-scale (and supposedly already around 1 GeV). Our plan is to utilize such laser-accelerated electron beams to realize table-top FELs. The essential feature of those electrons is their ultra-high beam current of up to few 100 kA in 10 fs. Such high currents make small-period undulators realistic, which require less electron energy for the same FEL wavelength. Together with low emittance and relatively large Pierce parameter the undulator length for reaching SASE saturation should be as small as only meter-scales. In this paper we present our first basic design considerations based upon start-to-end simulations including 3d PIC codes and GENESIS 1.3. In contrast to the large-scale XFELs, which will be dedicated user facilities, our aim is just to deliver the proof-of-principle of table-top FELs, starting from the VUV to the X-ray range.  
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WG313 Beam Physics Highlights of the FERMI@ELETTRA Project linac, emittance, electron, laser 27
 
  • S. Di Mitri, M. Cornacchia, P. Craievich, G. Penco, M. Trovo
    ELETTRA, Basovizza, Trieste
  • P. Emma, Z. Huang, J. Wu
    SLAC, Menlo Park, California
  • D. Wang
    MIT, Middleton, Massachusetts
  • A. Zholents
    LBNL, Berkeley, California
  The electron beam dynamics in the Fermi Linac has been studied in the framework of the design of a single-pass free electron laser (fel) based on a seeded harmonic cascade. The wakefields of some accelerating sections represent a challenge for the preservation of a small beam emittance and for achieving a small final energy spread. Various analytical techniques and tracking codes have been employed in order to minimize the quadratic and the cubic energy chirps in the longitudinal phase space, since they may cause a degradation of the fel bandwidth. As for the transverse motion, the beam breakup (bbu) instability has been recognized as the main source of emittance dilution; the simulations show the validity of local and non-local correction methods in order to counteract the typical “banana” shape distortion of the beam caused by the instability.  
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WG322 Status of the SPARX FEL Project emittance, linac, brightness, electron 30
 
  • C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  SPARX is a proposal for a X-ray-FEL facility jointly funded by MIUR (Research Department of Italian Government), Regione Lazio, CNR, ENEA, INFN and Rome University Tor Vergata. It is the natural extension of the ongoing activities of the SPARC collaboration. The aim is the generation of electron beams characterized by ultra-high peak brightness at the energy of 1 and 2 GeV, for the first and the second phase respectively. The beam is expected to drive a single pass FEL experiment in the range of 13.5–6 nm and 6–1.5 nm, at 1 GeV and 2 GeV respectively, both in SASE and SEEDED FEL configurations. A hybrid scheme of RF and magnetic compression will be adopted, based on the expertise achieved at the SPARC [1] high brightness photoinjector presently under installation at Frascati INFN-LNF Laboratories. The use of superconducting and exotic undulator sections will be also exploited. In this paper we discuss the present status of the collaboration.

on behalf of the SPARX team

 
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